Q. What is the pH of a neutral solution of hydrogen ions?
Solution
A neutral solution has a pH of 7.
Correct Answer: B — 7
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Q. What is the pH of a solution formed by mixing equal volumes of 0.1 M HCl and 0.1 M NaOH?
Solution
HCl and NaOH neutralize each other completely, resulting in a neutral solution with a pH of 7.
Correct Answer: A — 7
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Q. What is the pH of a solution that has a hydrogen ion concentration of 1 x 10^-5 M?
Solution
pH is calculated as pH = -log[H+]. For [H+] = 1 x 10^-5 M, pH = -log(1 x 10^-5) = 5.
Correct Answer: A — 5
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Q. What is the pH of a solution that has a hydronium ion concentration of 1 x 10^-5 M?
Solution
pH is calculated as pH = -log[H3O+]. For [H3O+] = 1 x 10^-5 M, pH = -log(1 x 10^-5) = 5.
Correct Answer: A — 5
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Q. What is the pH of a solution that has a hydroxide ion concentration of 1.0 x 10^-3 M?
Solution
pOH = -log[OH-] = -log(1.0 x 10^-3) = 3. Therefore, pH = 14 - pOH = 14 - 3 = 11.
Correct Answer: A — 11
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Q. What is the pH of a solution that has a [H+] concentration of 1 x 10^-7 M?
Solution
pH = -log[H+] = -log(1 x 10^-7) = 7.
Correct Answer: A — 7
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Q. What is the pH of a solution that is 0.1 M in both acetic acid and sodium acetate?
-
A.
4.76
-
B.
5.76
-
C.
6.76
-
D.
7.76
Solution
Using Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]); pKa of acetic acid = 4.76, so pH = 4.76 + log(1) = 4.76
Correct Answer: A — 4.76
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Q. What is the pH of a solution with a hydroxide ion concentration of 0.001 M?
Solution
pOH = -log[OH-] = -log(0.001) = 3; pH = 14 - pOH = 14 - 3 = 11
Correct Answer: B — 12
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Q. What is the pH of a solution with a hydroxide ion concentration of 1.0 x 10^-4 M?
Solution
To find the pH, first calculate pOH = -log[OH-] = 4, then use pH + pOH = 14, so pH = 14 - 4 = 10.
Correct Answer: A — 10
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Q. What is the pH of a solution with [H+] = 1 x 10^-6 M?
Solution
Using the formula pH = -log[H+], we find pH = -log(1 x 10^-6) = 6.
Correct Answer: A — 6
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Q. What is the phenomenon called when a liquid changes to gas at a temperature below its boiling point?
-
A.
Evaporation
-
B.
Condensation
-
C.
Sublimation
-
D.
Freezing
Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer: A — Evaporation
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Q. What is the phenomenon called when a liquid changes to gas at temperatures below its boiling point?
-
A.
Evaporation
-
B.
Condensation
-
C.
Sublimation
-
D.
Vaporization
Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer: A — Evaporation
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Q. What is the phenomenon called when a liquid rises in a narrow tube against gravity?
-
A.
Capillarity
-
B.
Viscosity
-
C.
Surface tension
-
D.
Hydrostatic pressure
Solution
Capillarity is the phenomenon where a liquid rises in a narrow tube against gravity due to adhesive and cohesive forces.
Correct Answer: A — Capillarity
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Q. What is the pKa value of acetic acid?
-
A.
4.76
-
B.
7.00
-
C.
9.25
-
D.
2.00
Solution
The pKa value of acetic acid is approximately 4.76.
Correct Answer: A — 4.76
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Q. What is the pKb value of a strong base?
-
A.
Less than 0
-
B.
Equal to 0
-
C.
Greater than 0
-
D.
Equal to 14
Solution
A strong base has a pKb value less than 0, indicating high basicity.
Correct Answer: A — Less than 0
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Q. What is the pKb value of a weak base?
-
A.
Less than 7
-
B.
Equal to 7
-
C.
Greater than 7
-
D.
None of the above
Solution
A weak base has a pKb value greater than 7.
Correct Answer: C — Greater than 7
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Q. What is the primary active ingredient in most antacids?
-
A.
Calcium carbonate
-
B.
Magnesium hydroxide
-
C.
Aluminum hydroxide
-
D.
All of the above
Solution
Most antacids contain active ingredients like calcium carbonate, magnesium hydroxide, or aluminum hydroxide to neutralize stomach acid.
Correct Answer: D — All of the above
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Q. What is the primary bond type in polymers?
-
A.
Ionic bonds
-
B.
Covalent bonds
-
C.
Metallic bonds
-
D.
Hydrogen bonds
Solution
Covalent bonds are the primary bond type in polymers, linking monomers together.
Correct Answer: B — Covalent bonds
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Q. What is the primary cause of global warming?
-
A.
Deforestation
-
B.
Greenhouse gas emissions
-
C.
Ozone depletion
-
D.
Acid rain
Solution
Greenhouse gas emissions, particularly CO2, are the primary cause of global warming.
Correct Answer: B — Greenhouse gas emissions
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Q. What is the primary cause of ocean acidification?
-
A.
Plastic pollution
-
B.
Increased CO2 absorption
-
C.
Heavy metal contamination
-
D.
Thermal pollution
Solution
Ocean acidification is primarily caused by the increased absorption of CO2 from the atmosphere into ocean waters.
Correct Answer: B — Increased CO2 absorption
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Q. What is the primary cause of the greenhouse effect?
-
A.
Ozone depletion
-
B.
Increased solar radiation
-
C.
Trapping of heat by greenhouse gases
-
D.
Deforestation
Solution
The greenhouse effect is primarily caused by the trapping of heat in the Earth's atmosphere by greenhouse gases.
Correct Answer: C — Trapping of heat by greenhouse gases
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Q. What is the primary characteristic of liquids that distinguishes them from solids?
-
A.
Definite shape
-
B.
Definite volume
-
C.
Incompressibility
-
D.
Fluidity
Solution
Liquids have fluidity, allowing them to flow and take the shape of their container.
Correct Answer: D — Fluidity
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Q. What is the primary driving force for adsorption in physisorption?
-
A.
Chemical bonds
-
B.
Van der Waals forces
-
C.
Hydrogen bonds
-
D.
Ionic interactions
Solution
Physisorption is primarily driven by weak van der Waals forces.
Correct Answer: B — Van der Waals forces
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Q. What is the primary effect of a -CN group on a benzene ring?
-
A.
+M effect
-
B.
-M effect
-
C.
+I effect
-
D.
-I effect
Solution
-CN exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer: B — -M effect
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Q. What is the primary effect of the -COOH group on a benzene ring?
-
A.
+M effect
-
B.
-M effect
-
C.
+I effect
-
D.
-I effect
Solution
The -COOH group primarily exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer: B — -M effect
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Q. What is the primary effect of the -COOH group on aromatic compounds?
-
A.
+M effect
-
B.
-M effect
-
C.
+I effect
-
D.
-I effect
Solution
-COOH exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer: B — -M effect
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Q. What is the primary effect of the inductive effect in organic compounds?
-
A.
Stabilization of positive charge
-
B.
Stabilization of negative charge
-
C.
Delocalization of electrons
-
D.
Formation of hydrogen bonds
Solution
The inductive effect involves the shifting of electron density through sigma bonds, which stabilizes positive charges.
Correct Answer: A — Stabilization of positive charge
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Q. What is the primary effect of the inductive effect in organic molecules?
-
A.
Stabilization of positive charge
-
B.
Stabilization of negative charge
-
C.
Delocalization of electrons
-
D.
Formation of hydrogen bonds
Solution
The inductive effect involves the shifting of electron density through sigma bonds, which can stabilize positive charges.
Correct Answer: A — Stabilization of positive charge
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Q. What is the primary factor affecting colligative properties?
-
A.
Nature of solute
-
B.
Concentration of solute
-
C.
Temperature
-
D.
Volume of solvent
Solution
Colligative properties depend primarily on the concentration of solute particles in a solution.
Correct Answer: B — Concentration of solute
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Q. What is the primary factor that affects the rate of a chemical reaction?
-
A.
Concentration
-
B.
Temperature
-
C.
Catalyst
-
D.
All of the above
Solution
All of the above factors affect the rate of a chemical reaction.
Correct Answer: D — All of the above
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